border-bottom
Quick Summary for border-bottom
border-bottom
shorthand CSS property sets an element's bottom border. It sets the values of border-bottom-width
, border-bottom-style
and border-bottom-color
.
Code Usage for border-bottom
border-bottom-style: dotted; border-bottom: thick green;
More Details for border-bottom
border-bottom
The border-bottom
shorthand CSS property sets an element's bottom border. It sets the values of border-bottom-width
, border-bottom-style
and border-bottom-color
.
As with all shorthand properties, border-bottom
always sets the values of all of the properties that it can set, even if they are not specified. It sets those that are not specified to their default values. This means that ...
border-bottom-style: dotted; border-bottom: thick green;
... is actually the same as ...
border-bottom-style: dotted; border-bottom: none thick green;
... and the value of border-bottom-style
given before border-bottom
is ignored. Since the default value of border-bottom-style
is none
, not specifying the border-style
part results in no border.
Constituent properties
This property is a shorthand for the following CSS properties:
border-bottom-color
border-bottom-style
border-bottom-width
Syntax
border-bottom: 1px; border-bottom: 2px dotted; border-bottom: medium dashed blue; /* Global values */ border-bottom: inherit; border-bottom: initial; border-bottom: revert; border-bottom: unset;
The three values of the shorthand property can be specified in any order, and one or two of them may be omitted.
Values
<br-width>
See border-bottom-width
.
<br-style>
See border-bottom-style
.
<color>
See border-bottom-color
.
Formal definition
Initial value | as each of the properties of the shorthand:border-bottom-width : medium border-bottom-style : none border-bottom-color : currentcolor |
---|---|
Applies to | all elements. It also applies to ::first-letter . |
Inherited | no |
Computed value | as each of the properties of the shorthand:border-bottom-width : the absolute length or 0 if border-bottom-style is none or hidden border-bottom-style : as specifiedborder-bottom-color : computed color |
Animation type | as each of the properties of the shorthand:border-bottom-color : a colorborder-bottom-style : discreteborder-bottom-width : a length |
Formal syntax
<line-width> || <line-style> || <color>where
<line-width> = <length> | thin | medium | thick<line-style> = none | hidden | dotted | dashed | solid | double | groove | ridge | inset | outset<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hwb()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
where
<rgb()> = rgb( <percentage>{3} [ / <alpha-value> ]? ) | rgb( <number>{3} [ / <alpha-value> ]? ) | rgb( <percentage>#{3} , <alpha-value>? ) | rgb( <number>#{3} , <alpha-value>? )<rgba()> = rgba( <percentage>{3} [ / <alpha-value> ]? ) | rgba( <number>{3} [ / <alpha-value> ]? ) | rgba( <percentage>#{3} , <alpha-value>? ) | rgba( <number>#{3} , <alpha-value>? )<hsl()> = hsl( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsl( <hue>, <percentage>, <percentage>, <alpha-value>? )<hsla()> = hsla( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsla( <hue>, <percentage>, <percentage>, <alpha-value>? )<hwb()> = hwb( [<hue> | none] [<percentage> | none] [<percentage> | none] [ / [<alpha-value> | none] ]? )
where
<alpha-value> = <number> | <percentage><hue> = <number> | <angle>
Examples
Applying a bottom border
HTML<div> This box has a border on the bottom side. </div>
CSS div { border-bottom: 4px dashed blue; background-color: gold; height: 100px; width: 100px; font-weight: bold; text-align: center; }
ResultsSpecifications
Specification |
---|
CSS Backgrounds and Borders Module Level 4 # border-shorthands |
See also
border
border-block
outline
Last modified: Aug 12, 2021, by MDN contributors
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